[RFC v4 02/11] vhost-vdpa: protect concurrent access to vhost device iotlb

[Xie Yongji <xieyongji@xxxxxxxxxxxxx>]

Use vhost_dev->mutex to protect vhost device iotlb from
concurrent access.

Fixes: 4c8cf318("vhost: introduce vDPA-based backend")
Signed-off-by: Xie Yongji <xieyongji@xxxxxxxxxxxxx>
---
 drivers/vhost/vdpa.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index c50079dfb281..5500e3bf05c1 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -723,6 +723,7 @@ static int vhost_vdpa_process_iotlb_msg(struct vhost_dev *dev,
 	if (r)
 		return r;
 
+	mutex_lock(&dev->mutex);
 	switch (msg->type) {
 	case VHOST_IOTLB_UPDATE:
 		r = vhost_vdpa_process_iotlb_update(v, msg);
@@ -742,6 +743,7 @@ static int vhost_vdpa_process_iotlb_msg(struct vhost_dev *dev,
 		r = -EINVAL;
 		break;
 	}
+	mutex_unlock(&dev->mutex);
 
 	return r;
 }
-- 
2.11.0